垃圾生物稳定化预处理中填埋污染潜力的变化

Changes of Pollution Potential During Biostabilization of Municipal Solid Waste as Pretreatment Prior to Landfill

实验测定生活垃圾填埋前生物稳定化预处理过程的相关指标,探讨生物稳定化处理对削减生活垃圾填埋污染的作用.结果表明:经44d两阶段(快速降解阶段+后腐熟阶段)生物稳定化处理后,生活垃圾重量减少约70%(湿重).生活垃圾中易降解有机组分明显减少,生物稳定性强的木质纤维素类约占有机物62%(干重);好氧呼吸速率(AT4)下降80%;填埋物的甲烷年排放估算值下降约80%.生活垃圾浸出液的化学需氧量(COD)和总有机碳(TOC)下降达90%以上;总氮(TN)和氨氮(NH4—N)最终质量浓度分别为峰值的60%和20%.说明经生物稳定化预处理后垃圾的填埋污染潜力明显下降.

Abstract：Related indexes of biostabilization, the pretreatment of municipal solid waste （MSW） prior to landfill are determined, and changes of pollution potential for landfill are discussed. After 44 days of biostabilization （active degradation stage and curing stage）, the weight of MSW reduces by about 70% （in wet weight）. The fractions of the readily degradable organic matters diminish significantly, but the lignocelluloses become the major components, reaching 62% （in dry weight）. The biological reactivity value AT4 reduces by 80%. The methane emissions are estimated to decrease by 80%. Both chemical oxygen demand（COD） and total organic carbon （TOC） in the eluates plummet by 90%. TN and NI4-N in the eluates decrease to 60% and 20% respectively. The above results show that the process of biostabilization can reduce the pollution potential for landfill.